<h2>Search</h2>
<form method="get" id="searchform" action="<?php bloginfo('home'); ?>/">
<input type="text" onfocus="if (this.value == 'Search this blog') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Search this blog';}" value="Search this blog" name="s" id="s" /></form>